alarm dialog fails to consume touch events

[forrestguice]

The alarm dialog fails to completely consume touch events, but instead allows some events to pass to the view behind it.

To reproduce:

1. Open the SuntimesAlarms activity.
2. Create several alarms if the list is empty (enough to cause the list to scroll).
3. Click the Add (+) button (opens the alarm dialog)
4. Click the Time tab (displays time picker).
5. Swipe up/down in the white space beside the picker.
   Observe: the list behind the dialog scrolls up/down; the touch events that are not caught by the picker are instead caught by the list.
6. Tap the white space beside the picker.
   Observe: the list item behind the dialog is now selected; if it was already selected then the EditActivity is launched.